[Accessibility] Add support for xcode 15 beta 4. (#18643)

Co-authored-by: GitHub Actions Autoformatter <github-actions-autoformatter@xamarin.com>

src/Accessibility/AXAnimatedImagesUtilities.cs

@@ -0,0 +1,18 @@
+#nullable enable
+
+using System;
+using System.Runtime.InteropServices;
+using CoreGraphics;
+using Foundation;
+using ObjCRuntime;
+
+namespace Accessibility {
+
+	public static partial class AXAnimatedImagesUtilities {
+
+		[DllImport (Constants.AccessibilityLibrary)]
+		extern static byte AXAnimatedImagesEnabled ();
+
+		public static bool Enabled => AXAnimatedImagesEnabled () != 0;
+	}
+}

src/accessibility.cs

@@ -7,6 +7,8 @@
 using NativeHandle = System.IntPtr;
 #endif
 
+#nullable enable
+
 namespace Accessibility {
 
 	[Watch (8, 0), TV (15, 0), Mac (12, 0), iOS (15, 0), MacCatalyst (15, 0)]
@@ -134,6 +136,11 @@ interface AXCustomContentProvider {
 		[Abstract]
 		[NullAllowed, Export ("accessibilityCustomContent", ArgumentSemantic.Copy)]
 		AXCustomContent [] AccessibilityCustomContent { get; set; }
+
+		[Watch (10, 0), TV (17, 0), Mac (14, 0), iOS (17, 0), MacCatalyst (17, 0)]
+		[NullAllowed, Export ("accessibilityCustomContentBlock", ArgumentSemantic.Copy)]
+		Func<AXCustomContent []?> AccessibilityCustomContentHandler { get; set; }
+
 	}
 
 	interface IAXDataAxisDescriptor { }
@@ -336,4 +343,13 @@ interface AXBrailleMapRenderer {
 		[Export ("accessibilityBrailleMapRenderer", ArgumentSemantic.Copy)]
 		Action<AXBrailleMap> AccessibilityBrailleMapRenderer { get; set; }
 	}
+
+	[Watch (10, 0), TV (17, 0), Mac (14, 0), iOS (17, 0), MacCatalyst (17, 0)]
+	[Static]
+	[Partial]
+	partial interface AXAnimatedImagesUtilities {
+		[Notification]
+		[Field ("AXAnimatedImagesEnabledDidChangeNotification")]
+		NSString AnimatedImagesEnabledDidChangeNotification { get; }
+	}
 }

src/frameworks.sources

@@ -34,6 +34,7 @@ ACCELERATE_SOURCES = \
 
 ACCESSIBILITY_SOURCES = \
 	Accessibility/AXHearingUtilities.cs \
+	Accessibility/AXAnimatedImagesUtilities.cs \
 
 # Accounts